MOO's printers use a 4 color ink process (CMYK). Please be aware that screen colors (RGB) may appear duller or lacking in contrast when printed.
Always preview your work in CMYK where possible.
We use public ICC profiles, so if you preview and save your files using the 'Coated GRACOL 2006' colorspace, they will not be altered by our back end processes.
To set the correct color space for your PDF, click on the 'output' option shown on the left of your screen when you select the 'Adobe PDF/X-1a:2001' preset. In the 'color' box, select 'Coated GRACOL 2006' from the destination dropdown.
Please note, we don't offer any spot color or any pantone matching, so its best to remove them from your PDFs and ensure only CMYK color values.
This video explains the difference between RGB and CMYK.